Provided by: libmongoc-doc_1.15.0-1_all bug


       mongoc_collection_command_simple - mongoc_collection_command_simple()


          mongoc_collection_command_simple (mongoc_collection_t *collection,
                                            const bson_t *command,
                                            const mongoc_read_prefs_t *read_prefs,
                                            bson_t *reply,
                                            bson_error_t *error);


       · collection: A mongoc_collection_t.

       · command: A bson_t containing the command to execute.

       · read_prefs:   An   optional   mongoc_read_prefs_t.  Otherwise,  the  command  uses  mode

       · reply: A location to initialize a bson_t. This should be on the stack.

       · error: An optional location for a bson_error_t or NULL.


       This is a simplified version of mongoc_collection_command() that returns the first  result
       document  in  reply. The collection's read preference, read concern, and write concern are
       not applied to the command. The parameter  reply  is  initialized  even  upon  failure  to
       simplify memory management.

       This  function  tries  to  unwrap  an  embedded  error  in  the command when possible. The
       unwrapped error will be propagated via  the  error  parameter.  Additionally,  the  result
       document is set in reply.


       Errors are propagated via the error parameter.


       Returns true if successful. Returns false and sets error if there are invalid arguments or
       a server or network error.

       This function does not check the server response  for  a  write  concern  error  or  write
       concern timeout.


       The following is an example of executing the collection stats command.

          #include <bson/bson.h>
          #include <mongoc/mongoc.h>
          #include <stdio.h>

          static void
          print_collection_stats (mongoc_collection_t *collection)
             bson_error_t error;
             const char *name;
             bson_t *cmd;
             bson_t reply;

             name = mongoc_collection_get_name (collection);
             cmd = BCON_NEW ("collStats", BCON_UTF8 (name));

             if (mongoc_collection_command_simple (
                    collection, cmd, NULL, &reply, &error)) {
                str = bson_as_canonical_extended_json (&reply, NULL);
                printf ("%s\n", str);
                bson_free (str);
             } else {
                fprintf (stderr, "%s\n", error.message);

             bson_destroy (&reply);
             bson_destroy (cmd);


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